That is interesting saying. It makes us to think deeper about the world we are living it. In my opinion everything that is surrounding us is art. We're creating our own art.
If taking for example nature. Isn't it beautiful? Mountains, lakes, forests, seas, canyons, trees, flowers, animals...everything from this list is art. And it is more than beautiful, it's amazing.
Imagine our planet without it. Like there is nothing, just 1 road everywhere. Will it be beautiful? will it take a breath away? Of course not.
The biggest problem is, that people are not caring about everything what is around us. They are cutting down trees, hunting on animals, polluting rivers, lakes and seas and air. And if people won't stop, Earth will for sure become just big "EH". It will be ugly. And nobody will like it at all. But it will be too late to stop.